DVDX.EXE error msg DSOUND.DLL-11

I'm attempting to convert dvd files to reburn to disc and when i try to open my DVDX i get the error msg stating The DVDX.EXE file liked to missing export DSOUND.DLL-11...... then I get a secound box saying there is a part of my system not functioning... Can someone please help me.. I just downloaded this DVD ripper burner package that uses smart ripper. It said i can rip and burn DVD to regular 80min discs... I have no way to contact them... Can someone help me...